請(qǐng)你做小法官,把錯(cuò)誤改正過來.
(1)4×3.75+0.25
=4×4
=16
=0
(2)6.4+3.6×5.3
=10×5.3
=53
(3)15.8-0.8×2
=15×2
=30
(4)4.5×0.9+6.8
=4.05+6.8
=4.73.
分析:(1)(2)應(yīng)先算乘法,再算加法,故原題錯(cuò)誤;
(3)應(yīng)先算乘法,再算減法,故原題錯(cuò)誤;
(4)運(yùn)算順序正確,但在計(jì)算4.05+6.8時(shí),小數(shù)點(diǎn)沒有對(duì)齊,故原題錯(cuò)誤.
解答:解:(1)4×3.75+0.25
=4×4
=16
=0(×)
改正:4×3.75+0.25
=15+0.25,
=15.25;

(2)6.4+3.6×5.3
=10×5.3
=53(×)
改正:6.4+3.6×5.3
=6.4+19.08
=25.48;

(3)15.8-0.8×2
=15×2
=30(×)
改正:15.8-0.8×2
=15.8-1.6,
=14.2;

(4)4.5×0.9+6.8
=4.05+6.8
=4.73.(×)
改正:4.5×0.9+6.8
=4.05+6.8
=10.85.
點(diǎn)評(píng):解答此題應(yīng)注意運(yùn)算順序以及運(yùn)算法則,同時(shí)注意小數(shù)點(diǎn)要對(duì)齊.
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